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    Can't draw a square

    QuasarCreatorQuasarCreator Member
    edited July 2012 in General questions
    I am trying to make a square and I am getting this error:

    level1.lua:16: bad argument #1 to 'setAsBox' (b2PolygonShape expected, got number)
    stack traceback:

    Here is my code:
     
local square = b2.PolygonShape.setAsBox(20, 20, 0, 0, 0)
square:setFillStyle(Shape.NONE)
square:setLineStyle(1, 0x000FF, 2)
self:addChild(square)
    So why am I getting this error? I can't seem to find anything I did wrong.

    -Thankyou in advance!!
    I am a programming noobie, so thanks in advance for helping me out and answering my questions!
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    Comments

    • talistalis Guru
      edited July 2012
      Did you include box2d in your lua code.?
      require "box2d"
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    • TeranthTeranth Member
      Well, you seem to be trying to draw a square but using the Box2D physics object.

      In example:
      -- Include Box2D
require "box2d"
 
-- Create a Box2D shape for physics use--does not display unless you 
-- use debugdraw or atatch a sprite.
local square_b2d = b2.PolygonShape.new()
square_b2d:setAsBox(20, 20, 0, 0, 0)
      Or if you actually want to draw just a box on the screen you could do this.
      -- Create a new shape drawing.
local square_shape = Shape.new()
square_shape:setFillStyle(Shape.NONE)
square_shape:setLineStyle(1, 0x000FF, 2)
 
-- Define a square with side length of 100
square_shape:beginPath()
square_shape:lineTo(0, 100)
square_shape:lineTo(100, 100)
square_shape:lineTo(100, 0)
square_shape:lineTo(0, 0)
square_shape:endPath()
 
-- Add the square drawing to the scene.
stage:addChild(square_shape)
      I may be misunderstanding, but to create a physics shape you would do the first example--and attach a sprite to it so you can detect collisions and use gravity and the good stuff.

      The second example just draws a square on the screen, and returns a sprite you can scale, rotate, and such.

      Hope it helps :)

      Eli

      Likes: QuasarCreator

      ThumbHurt Games / FB: ThumbHurt Games / FB: Eli/Teranth | Skype: teranth37
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    • QuasarCreatorQuasarCreator Member
      @Teranth - I did include require "box2d" but I wanted just a plain box so I went with your second example. Thankyou very much!
      I am a programming noobie, so thanks in advance for helping me out and answering my questions!
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    • TeranthTeranth Member
      @QuasarCreator Anytime, this forum is very helpful feel free to ask anything you get stuck on :) Glad I was able to help you out.
      ThumbHurt Games / FB: ThumbHurt Games / FB: Eli/Teranth | Skype: teranth37
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